Control switch



Sept- 22, 1942- l R. K. ENGHOLDT 2,296,381

CONTROL SWITCH Filed May 25, 19,40

y,2 sheets-sheet 1 Sept 22, 1942 R. K. ENGHolfD-r 2,296,381

CONTROL SWITCH BY l Patente-dnA Sep\t.22l,i v19.42

2,296,381 coN'raor. swrron melma x. vannimmt, milwaukee, wis., assignerto Milwaukee Gas Specialty Company, Milwaukee, Wis., a corporation ofWisconsin Application May 25, 1940,I Serial No. 337,178

12 Claims. v(Cl. 20o-153) v y a .means for indicating the position ofthe switch.

The present invention relates to a control device, and more particularlyto a switch controlled by condition responsive means,

The principal field of utility of the invention is in connection withfuel burners having a fuel supply. pipe leading to the burner, a valve,such as a solenoid or motor valve, in the fuel supply pipe, and a safetyshutoff feature adaptedv to effect operation of the valve to closeposition to shut olf the supply of fuel to the burner when the pilotlight associated with the burner goes out, and operative to prevent thevalve from being opened until the pilot light is ignited. It is to beunderstood, however, that the invention is not limited to thisparticular field of utility but maybe employed in all similar work assuitable or desired.

For example, the control switch of the present invention may be employedin conjunction with valves that require current or power for bothopening and closing, and the switch and control features of the presentinvention may be used for controlling other circuits' than theparticular circuit shown and describedfor example, for controlling alarmcircuits, and for all similar purposes. K

One of the mainyobjects of the invention is to provide in a device ofthe class described an electromagnet or other suitable holding means, anamature or other means, operating means for cooking the armature orother means to the position in which it is held by the holding means, aswitch movable with the cooking means in the cooking operation, andimproved means for actuating the switch to one position when the holdlngmeans is eifective to accomplish its holding function and the cookingmeans is released, which improved means is also effective to actuate theswitch to its other position when the holding meansA istrenderedineffective to accomplish its holding function, for example byextinguishment of the pilot light.

bIt is another object of the invention to provide improved means of thecharacter set forth which will not operate the switch, for example, toclose the circuit for opening the valve until the pilot light is ignitedandthe holding means is operative to accomplish its holding function.

Another object of the invention is to provide in a device of thecharacter described a snapacting toggle switch and improved actuatingmeans therefore for accomplishing the results vset forth.

Another object of the invention is to provide in a device of thecharacter described improved Another object of the invention is toprovide an improved thermoelectrio safetylcontrol and switch combinationof relatively simple and inexpensive, construction, and 4which may beinstalled and operated conveniently and effectively; also a device ofthe character described composed of relatively few parts and adapted forconvenient and expeditious manufacture and assembly and which willoperate quickly, positively, and effectively,` and will fail safe -Ifthe valve under the control of the switch is closed, it will remain inthat position against being opened by the cooking operation until acertain condition is set up, for example, until the pilot burner isignited and the holding means rendered effective, and if the valve is inopen position, it will immediately move to closed position upontermination of said condition, i. e., when the pilot light goes out. v

While the particular structural features by which I obtain a device ofthe character set forth and the switch entering into the combination areimportant features within the more speciflc aspects of the invention,itis to be understood that these features 'may be varied within thebroader aspects of the invention.

Further objects and advantages of the invention will be apparent fromthe following detailed description, taken in connection with theaccompanying drawings in which:

. Figure 1 is a more or less diagrammatic view showing an embodiment ofthe invention in a fuel burner supply system; v

Figure 2 is a front view of the control device of the present invention,with parts thereof in section; v

Figure 3 is a fragmentary detail view showing the guide bracket for theactuator member;

Figure 4 is a fragmentary view, partially in elevation and partially insection, taken from one side of the device as viewed in Figure 2;

and l Figure 5 is a fragmentary view taken from the same direction asFigure 2 and showing the switch in a different circuit controllingposition.

The invention can be embodied in av wide variety of forms, and isadapted for use with a wide variety of control systems. It is, aspreviously stated, particularly applicable for4 use as a part of asafety pilot control in a fuel burner control system and has beenshownas embodied for such use. l

In Figure 1 of the drawings, a gas or other fuel burner of any suitableor preferred type is conheater, floor furnace. gas range, or any otherburner. A gas or other fuel supply pipe II leads to the burner Il forthe delivery of gas or other fuel thereto-for example, through a mixingchamber (not shown) to which air is admitted in the usual way, as wellunderstood in the art.

'I'he fuel supply pipe II has a power actuated shutoff valve I2, such asa solenoid or motor valve. 'I'he valve I2 is shown as comprising a valvebody I3 and a hood I4 having suitable power operated valve actuatingmeans therein. A step-down transformer I5 supplies power for theoperation of the system. 'I'his transformer comprises a line voltageprimary I6 and a low vvoltage secondary I'I. The primary I8 is connectedto line wires IB leading to any suitable source of current or power (notshown). The valve actuating means for the valve I2 is connected into thesecondary circuit I9. The control switch of the present invention isalso connected into the secondary circuit I9 as will presently morefully appear.

For purposes of illustration, it may be assumed that the valve I2 is ofa character to be actuated to open position by closing of the circuit I9and to be held in open position to V supply fuel or operative energy tothe burner I9- as long as the circuit I9 is closed. The valve I2 mayhave spring means, or other suitable means, for actuating the valve toclosed position to shut on the supply of fuel to the burner I 0 when thecircuit I9 is opened or interrupted.

The control switch is shown 'as located within a housing 20. Secured tothe rear wall of the housing 20 is an angle-shaped guide bracket 2I. Anactuator member or operating lever 22 is slidingly mounted in the,outwardly extending ieg `of the guide bracket 2| and in the base orwall 23 of the housing 20. The particular actuator member shown in thedrawings comprises a pair of members having their outer ends securedtogether and operating slidingly through the. opening in the wall 23.'The inner ends .of these members are forked apart, and the inner orreararm of the forked part is shown asthe part which is slidinglymounted in the bracket 2|. The outer end of the actuator; member isprovided with an operating button 24.

The holding means is shown in the form of an electromagnet also located-within the housing 20. The electromagnet selected for illustrationcomprises'a magnet frame26 secured, for example, to a terminal bushing28 in the manner more fully disclosed in my copending application SerialNo. 328,923, filed Aprill 10, 1940. The coil 330i the electromagnet iswound-around the legs of the magnet frame 26. The bushing 28 is shown asexternally threaded for threaded engagement with a nut 3| by means ofwhich the bushing is clamped to the outer end of the electromagnet andarmature enclosing and mounting cup 32.

The externally threaded outer end of the bush-- it may be supplied withfuel for delivery to the pilot burner in any other desired manner.

A thermocouple, indicated at 3l, is placed in position so that the hotjunction 40 thereof will be heated by the pilot flame as long as thepilot flame is burning. The construction of the thermocouple may besimilar to that more fully disclosed in Oscar J. Leins Patent No.2,126,564, granted August 9, 1938, or the construction of thevthermocouple and the leads therefor may be of any other suitable orpreferred form.

For the purpose kof the present description, suilice it to state thatthe particular thermocouple 38 selected for illustration comprises anouter tubular metallic thermocouple element 42 and an inner metallicthermocouple element 43 of different thermoelectric characteristics.'I'he inner thermocouple element 43 is joined at one end to the outerend of the outer thermocouple element 42 to form the thermojunctionwhichis placed in position to be heated by the pilot light at the pilotburner 3B. An inner lead conductor 44 is Joined to the innerthermocouple element 43 to form an internal thermoiunction 45, and anouter tubular lead conductor 43 is connected to the outer thermocoupleelement 42, for instance, through a sleeve 4'I, to form a thirdthermojunction 48. The inner lead conductor 44 is insulated from theouter lead conductor 46, for instance, by a wrapping of insulation onthe inner lead conductor as indicated at 50.

A quick detachable or removable connection is preferably providedbetween the opposite ends of the leads 44 and 46 and the coil 30 of theelectromagnet. This removable lead connection may be of the formdisclosed in my copending application above identified, and isillustrated in that form, or it may be of any other suitable orvpreferred form. Suillce it, i'or purposes of this descrlptionto statethat'the inner lead 44 has a connector cone 52 which seats in the corre--spondingly recessed outer end of the terminal tip 53 and is clamped incontact therewith by a connector sleeve 54. The adjacent end of theouter tubular lead conductor 46 is connected in circuit with one sideoi' the coil 30 through the connector sleeve 56 Vand thebushing 23, andthe other side of the coil is connected to'vthe terminal tip 53, theparts being suitably insulated as shown.

VThe electromagnet has an amature 30 attached tothe end of a stern 62,if desired, in a manner to permit self-accommodation of the armature,when in attracted position, to the pole ends ofthe magnet frame 2B. Theelectromagnet and armature are enclosed within the cup 32. The innerendof the cup 32 is closed by guide and closure means shown as comprising acup-shaped bearing plate 63 having pressed fit or other suitableengagement in the inner end of the cup 32. A spring seating disk isshown ai; 64, and suitable sealing material, such as felt packing or thelike, as indicated at B3, is provided between the members 63 and 64 andaround the stem 62 to seal the interior of the cup 32 along this stem-The end of the stem 82 opposite the end on which the armature 60 ismounted is secured by a pin 69 in a member 10. This member- 10 operatesbetween the arms of the forked inner end of the actuator-member 22. Thearms of the forked inner end of the member 22 are slotted at 1I, anda'pin 'I2 extends through the member 10 with its opposite ends operatingslidingly in the slots 1I. The opposite ends of the pin 12 may be headedas shown in Figure 4', or provided with other stop means for preventingdisplacement of the pin.

The switch, designated in its entirety at 14, is a toggle switch ofexisting form except for the manner iny which. it is combined with theother parts of the device, and, for certain features to the end ofeffecting the desired combination for the purpose of the presentinvention. The construction of the particular switch 14 selected forillustration may be similar to that more fully disclosed in my copendingapplication Serial No. 263,589, led March 23, 1939.

For the purpose of the present description, sufflce it to state thatthe,V particular switch shown in the drawings comprises a pair ofcontacts 16 and 11 insulated from each other by insulating strips 18which with the contacts are secured 4together and in insulated relationin a switch frame 19 of generally channel-shaped cross-section. Aferrule 80 is secured to the switch frame 19, and this ferrule 80 isslotted to receive a switch operating lever 82 which is pivoted to theferrule 80 or to the switch body by a pin 83. The

switch operating lever 82 is .of generally bell crank form. One arm 84of the lever is pivoted on the pin 12 in the slot or bifurcation 65 inthe member 10.

The other arm 86 of the lever 82 has a flag or indicator member 81provided with a colored or appropriately marked portion 88 which, whenthe device is set or cocked in operating position,

' is displayed through an opening 89 in the front wall 90 of thevhousing 20 to indicate that the device is in operating position, Duringthe cocking operation and when the electromagnet is deenergized to closethe valve I2, the indicator portion 88 of the member 81 is moved out ofregister with the opening 89 so that a person may ascertain at a glancefrom outside the housing 20 the condition of the device.

A coiled spring 92 connected at one end at 93 to the base or wall 23 ofthe housingv 20 and,

at its opposite end at 94 to one of the arms of the actuator member 22,maintains the actuator member 22 yieldingly in the position shown inFigure 2, and returns this member to this position following the cockingor setting operation. A spring 96, coiled about the stem 62 andinterposed between the spring seating member 64 and the member 10, isheld compressed as shown in Figure 5 when the actuator member 22 ispressed inwardly to move 4the armature 60 to attracted position againstthe pole ends of the magnet frame 26 andthe electromagnet is energizedto hold the armature in attracted position. vDeenergization yof theelectromagnet releases the armature, and the spring 96 returns themember 10 to `its outwardly projected position as shown in Figure 2, orif the device is cocked and the electromagnet is not energized or, forany reason, fails to holdthe member 10 in cocked position, the-spring 96returns this member and the stem 62 to outwardly projected position withthe movement of the actuator member 22 to such position.

The switch 14 is pivoted in the forked inner end of the actuator member22 on a pin 98, and the outward movement of the actuator member 22islimited, for example, by a Cotter pin 99.

This pin 99 is shown as bent at |00 around one edge of the actuatorVmember or lever 22 to prevent the pin from turning and interferingwithv the full outward projection of the lever.

The pivotal movement of the switch arm 82 relative to the switch 14 isadapted to actuate the roller contact |05 of the toggle switch 14 intoand out of contact with the arcuate conon the inner side of the back ofthe housing is an insulating terminal block I5 supporting terminalmembers II6 and II1 in insulated relation. The contact 'I6 is connectedby a lead I I8 and terminal screw II9 to the terminal member II1, andthe contact 11 is connected by alead |20 and terminal screw I2I to theterminal member IIS. The conductors I9 of the circuit for the valve I2,which are insulated at |22, enter the housing 20 through an insulatinggrommet |24, One of the conductors I9 is connected by a terminal screw|25 to the terminal memberr |I6. The other conductor I9 is connected bya terminal screw |26 to the terminal member II'I.

When the roller contact |05 is engaged with the contacts 16 and 11 asshown in Figure 5, the circuit I9 is closed, thereby energizing-thevalve I2 to open and hold this valve in open position for supplying fuelto the burner I0. When the roller contact |05 is snapped to its oppositeportion as shown in Figure 2, the circuit I9 is opened or interrupted,thereby releasing the valve I2 for movement, for example, by a spring(not shown) toy closed position, shutting off the supply of fuel to theburner.

For purposes of illustration, one set of contacts 16, 11 has been shown.Itis to be understod that any desired number of contacts may beemployed-for example, an additional contact at the opposite end of thearcuate track of the toggle switch for a three wire circuit. Moreover,ii' desired, one pair of contacts may be employed at each of theopposite ends of the arcuate track of second pair bridged when theswitch is in the other position.

A thermostat, limit switch, or other conditionresponsive device may beprovided in the circuit I9 for the valve I2 within the scope of thepresent invention. Such a device'would operate to open the circuit forthis valve so that the valve will close upon the temperature risingabove a predetermined value 'or upon some other abnormal ormalfunctioning of the apparatus.

To start the operation of the system, the following sequence isfollowed:

The actuator member or cocking lever 22 is pressed inwardly from theposition shown in Figure 2 by engaging the button 24 with the hand orfingers imparting pressure thereto. The switch 14 and the switchoperating arm 82, as well as the stem 62, are moved inwardly with thisinward movement of the actuator member 22 until the armature is cockedor set into attracted position against the pole ends o1 the magnet frame26.

The pilot vburner 36 is lighted, o1, having been lighted, heats thethermocouple, and the lever 22 is held pressed inwardly until the heatof the pilot name on the thermocouple has energized the eleotromagnetsufficiently so that it will hold the armature 60 thereto.

When the electromagnet is energized suiiiciently to hold the armature 60in attracted position, the lever or cooking member 22 is released, andthe stern 62 remains in cocked position holding the end of the switcharm 84, which is pivoted at 12, in the position shown in Figure 5.Release of the actuator lever 22 allows the spring 92 to return thislever to its outwardly projected position as shown in Figure 5. Theswitch 14, moving outwardly with the lever, acts through its pivotalconnection with the lever at 98 and its pivotal connection with theswitch operating arm 82, at 83, to swing this arm 82 in a clockwisedirection from the position shown in Figure 2 to the position shown inFigure 5. This actuates the roller contact |05 into contact with thecontacts 16 and 11 with a snap action to close the circuit I9 for thevalve I 2. As a result, this valve is actuated to open position and heldin open position to pass fuel to the main burner as long as the partsare in the positions last described.

If the pilot burner is not lighted to produce the thermo-electriccurrent for holding the armature 60 in attracted position upon settingthe same to that position by the cooking lever 22, the armature 60 andthe stem 62 and member 10 will move outwardly with the actuator member22 when the same is released after being actuated to set the armature inattracted position. As a result, the switch operating arm 82 will moveoutwardly with the other parts and there will be no swinging or pivotalmovement of this arm with respect to the switch 'I4 to actuate theroller contact |05 into engagement with the contacts 'l and l1. If,after the parts are set as shown in Figure 5 and the pilot burner islighted to hold the parts in the positions shown in this figure, thepilot burner is extinguished, the-armature 60 is released. The spring 96then operates to move the armature to retracted position and the stem 62and member 'l0 in a downward direction as shown in the drawings. Thisswings the switch operating arm 82 in a counterclockwise directionthrough the pivotal connection at 72 and actuates the contact roller toposition out of engagement with the contacts 16 and 11, as shown inFigure 2. This opens or interrupts the circuit i9, and the valve l2operates to closed position to shut off the supply of fuel to the pilotburner.

I contemplate within the scope of my present invention removing oromitting the spring 92. With this spring 92 removed or omitted and thearmature in attracted position, the switch may be actuated to on or offposition by manually actuating the lever or actuator 22 out or inrespectively.

The embodiment of the invention shown in the drawings is forillustrative purposes only, and it is to be expressly understood thatsaid drawings and the accompanying specication are not to be construedas a definition of the limits or scope of the invention, reference beinghad to the appended claims for that purpose.

I claim:

1. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, a second memberadapted to be cocked by movement of said actuator member to cookingposition, means for holding said second member in cocked position, aninsulating contact supporting body carried by said actuator' member formovement with said actuator member to its cooking and releasedpositions, iirst contact means carried by said contact supporting body,a switch operating arm pivoted to said second member and to said contactsupporting body, and second contact means operatively connected to saidswitch operating arm and actuated into contact with said tlrst contactmeans by pivotal movement imparted to said arm by movement of saidactuator member to released position with said second member held incocked position, said second contact means being lactuated to positionout of contact with said rst contact means by pivotal movement impartedto said arm by movement of said second member to retracted position.

2. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, a second memberadapted to be cocked by movement of said actuator member to cookingposition, means for holding said second member in cooked position, aninsulating contact supporting body carried by said actuator member formovement with said actuator member to its cooking and releasedpositions, first contact means carried by said contact supporting body,a switch operating arm pivoted to said second member and to said contactsupporting body, second contact means, and a toggle connection betweensaid switch operating arm and said second contact means and operable toactuate said second contact means into contact with said rst contactmeans by pivotal movemnt imparted to said arm by movement of saidactuator member to released position with said second member held incocked position, said toggle connection actuating said second contactmeans to position out of contact with said rst contact means by pivotalmovement imparted to said arm by movement of said second member toretracted position.

3. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, a second memberadapted to be cooked by movement of said actuator member to cookingposition, means for holding said second member in cocked position, an tinsulating contact supporting body carried by said actuator member formovement with said actuator member to its cooking and releasedpositions, first contact means carried by said contact supporting body,a switch operating arm pivoted to said second member and to said contactsupporting body, second contact means operatively connected to saidswitch operating arm and actuated to position out of contact with saidrst contact means by pivotal movement imparted to said arm by movementof said second member to released position, and a spring operative tomove said actuator member to released position, the movement of saidcontact supporting body with said actuator member to its releasedposition with said second member held in cocked position swinging saidswitch operating arm in a direction to move said second contact meansinto contact with said first contact means.

4. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, a second memberadapted to be cocked by movement of said actuator memberto cookingposition, means for holding said second member in cocked position, aninsulating contact supporting body carried by said actuator member formovement with said actuator member to its cooking and releasedpositions, rst contact means carried by said contact supporting body, aswitch arm pivoted to said ment between cooking and released positionsand` second member and to said contact supporting body, second contactmeans, a toggle connection between said switch operating arm and saidsecond contact means and operable to actuate said second contact meansto position out of contact with' said rst contact means by pivotalmovementv imparted to said arm by movement of said second member toreleased position, and a spring operative to move said actuator memberto released position, the movement of said contact supporting body withsaid actuator member to its released position, with said second memberheld in cocked position, swinging said switch cperating arm in adirection to movesaid second contact means into contact with said firstcontact means.

5. In a switch of the class described, in com-` bination, a guidebracket, an actuator member guided in said bracket for rectilinearmovement between cooking and released positions, a second member havingrectilinear movement between cocked and released positions and adaptedto be cocked by movement of said actuator member to cooking position,means for holding said second member in cocked position, a contactsupporting body attached to the actuator member for movement with saidactuator member to its cooking and released positions, iirst contactmeans carried by said contact supporting body, a switch operating armpivoted to said second member in position spaced from the attachment ofsaid contact supporting body to said actuator memberin the directioin ofrectilinear movement of said actuator member and said second member, apivotal connection between said switch operating arm and said contactsupporting body, and second contact means operatively connected to saidswitch operating arm and actuated into contact with said first contactmeans by separation of the attachment of said contact carrying arm tosaid actuator member from the pivotal connection between said switchoperating arm and said second member.

6. -In a switch of the class described, in combination, a guide bracket,an actuator member guided in said bracket for rectilinear movementbetween cooking and released positions, a second member havingrectilinear movement between cocked and released positions and adaptedto be cocked by movement of said actuator member to cooking position,means for holding said second member in cocked position, a contactsupporting body attached to the actuator member for movement with saidactuator member to its cooking and released positions, first contactmeans carried by said contact supporting body, a switch operating armpivoted to said second member in position spaced from the attachmentl ofsaid contact supporting body to said actuator member in the direction ofrectilinear movement of said actuator member and said second member, apivotal connection between said switch operating arm and said contactsupporting body, second contact means, and a toggle connection betweensaid switch operating arm and said second contact means and operable toactuate said second contact means into contact with said first contactmeans by separation ofthe attachment of said contact carrying body tosaid actuator member from the pivotal connection between said switchoperating arm and said second member.

7. In a switch of the' class described, in combination, a guide bracket,a forked actuator member guided in said bracket for rectilinearmovehaving spaced arms having slots therein, a second member havingrectilinear movement between cocked and released positions and adaptedto be cocked by movement of said actuator member to cooking position,said second member being positioned between the arms of said actuatormember and having a pin operable slidingly in the slots in said arms,means for holding said second member in cocked position, a contactsupporting body attached to the actuator member for movement with saidactuator member to its cooking and released positions, rirst contactmeans carried by said contact supporting body, a switch operating armpivoted to said second member in position spaced from the attachment cisaid contact supporting body to said actuator member in the direction ofrectilinear movement of said actuator member and said second member, apivotal connection between said switch operating arm and said contactsupporting body, and second contact means operatively connected to saidswitch operating` arm and actuated into contact with said first. contactmeans by separation of the attachment of said contact carrying body tosaid actuator member from the pivotal connection between said'switchoperating arm and said second member.

8. In a switch of the class described, in combination, a guide bracket,a forked actuator member guided in said bracket for rectilinear movementbetween cooking and released positions and having spaced arms havingslots therein, a second member having rectilinear movement betweencocked and released positions and adapted to be cocked by movement ofsaid actuator member to cooking position, said second member beingpositioned between the arms of said actuator member and having a pinoperable slidingly in the slots in said arms, means for holding saidsecond member in cocked position, a contact supporting body attached tothe ac tuator member for movement with said actuator member to itscooking and released positions, first contact means carried by saidcontact supporting body, a switch operating arm pivoted to said secondmember in position spaced from the attachment of said contact supportingbody to said actuator member in the direction of rectilinear movement ofsaid actuator member and said second member, a pivotal connectionbetween said switch operating arm and said contact supporting body,second contact means, and a toggle connection between said switchoperating arm and said second contact means and operable to actuate saidsecond contact means into contact with said first contact means byseparation of the attachment of said contact carrying body to saidAactuator'member from the pivotal connection between said switchoperating arm and said second member.

9. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, selectivelyoperable holding means, a switch operating member adapted to be cockedto position to be held by said holding means by movement of saidactuator member to cooking position, saidactuator member being movableto released position free of said switch operating member and said(switch operating member bem movable to released position upon release ofsaid holding means, nrst contact means carried by said actuator memberfor movement with said actuator member to its cocking and releasedpositions, second contact means movable into and out oi contact withsaid first contact means,- and an operating connection between saidswitch operating member and said second contact means for moving saidsecond contact means into contact with said ilrst contact means bymovement oi said actuator member to released position with said switchoperating member held in cocked position by said holding means andoperative to movesaid second contact means out of contact with said rstcontact means by movement of said switch operating member to releasedposition. 10. In a switch of the class described, in combination, anactuator member movable between cocking and released positions,selectively operable holding means, a switch operating member adapted tobe cocked to position to be held by said holding means by movement ofsaid actuator member to cocking position, said actuator member beingmovable to released position free of said switch operating member andsaid switch operating member being movable to released position uponrelease of said holding means, first contact means pivoted to saidactuator member for movement with said actuator member to its cookingand released positions, second contact Y means movableinto and out oicontact with said iirst contact means. and a toggle connection betweensaid switch operating member and said second contact means for movingsaid second contact means into contact with said first contact means bymovement of said actuator member toireleased position with said switchoperating member held in cocked position by said holding means andoperative to move said second contact means out of contact with said rstcontact means by movement oi said switch oper. ating member to releasedposition.

' 11. In a switch of the class described, in combination, an actuatormember movable between cooking and released positions, selectivelyoperable holding means, a switch operating member adapted to be cockedto position to be held by said holding means by movement of saidactuator member to cooking position, said actuator member being movableto released position free oi said switch operating member and saidswitch operating member being movable to released position upon releaseoi said holding means, iirst contact means pivoted to said actuatormember for movement with said actuator member to its cooking andreleased positions. second contact means movable into and out of contactwith said iirst contact means, and a toggle connection between saidswitch operating member and said second contact means ior moving saidsecond contact means into contact with said first conbination, anactuator member having rectilinear movement between cooking and releasedpositions, a second member having rectilinear movement between cockedand released positions and adapted to be cocked by movement oi saidactuator member to cooking position, means for holding said secondmember in cocked position, an insulating contact supporting body carriedby said actuator member for movement withsaid actuator member to itscooking and released positions, first contact means carried by saidcontact supporting body, a switch operatingT arm pivoted to said secondmember and to said contact supporting body, and second contact meansoperativelyconnected to said switch operating arm and actuated intocontact with said first contact means by pivotal movement imparted tosaid arm by rectilinear movement of said actuator member to releasedposition with said second 'movement of said second memberto retractedposition. V

RICHARD K. ENGHOLDT.

